21166342311752 has 32 divisors (see below), whose sum is σ = 45573464311200. Its totient is φ = 9114692860800.

The previous prime is 21166342311749. The next prime is 21166342311817. The reversal of 21166342311752 is 25711324366112.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6329646149 + ... + 6329649492.

It is an arithmetic number, because the mean of its divisors is an integer number (1424170759725).

Almost surely, 2^{21166342311752} is an apocalyptic number.

21166342311752 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21166342311752 is an abundant number, since it is smaller than the sum of its proper divisors (24407121999448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21166342311752 is a wasteful number, since it uses less digits than its factorization.

21166342311752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12659295677 (or 12659295673 counting only the distinct ones).

The product of its digits is 362880, while the sum is 44.

Adding to 21166342311752 its reverse (25711324366112), we get a palindrome (46877666677864).

The spelling of 21166342311752 in words is "twenty-one trillion, one hundred sixty-six billion, three hundred forty-two million, three hundred eleven thousand, seven hundred fifty-two".